import numpy as np
import cv2 as cv
from matplotlib import pyplot as plt

img = cv.imread('image_5.jpg', cv.IMREAD_GRAYSCALE)

# Initiate ORB detector
orb = cv.ORB_create()

# find the keypoints with ORB
kp = orb.detect(img, None)

# compute the descriptors with ORB
kp, des = orb.compute(img, kp)

# draw only keypoints location,not size and orientation
img2 = cv.drawKeypoints(img, kp, None, color=(0, 255, 0), flags=0)
plt.imshow(img2), plt.show()